Piezoelectric Ceramics

CEL is Pioneer in manufacturing of different type of PZT elements since 1976 in India.. CEL manufactures various grade of Piezo-ceramics elements for low power as well as high power application that is PZT-5A, PZT-5H, PZT-5J for low power applications and PZT-4, PZT-8 for high power applications. Piezo ceramics elements can be manufacture in any shape or sizes as per the requirement.These are more versatile with physical, chemical and piezoelectric characteristics able to be tailored to specific applications. Ceramics can be manufactured in almost any given shape or size.

PZT-5A is used for low power systems and in others applications where is required high di-electric constant, high voltage sensitivity, volume resistivity and stability over a wide temperature range. It is most suitable for making the low power transducers, acoustic sensing elements, flaw detection probes, Piezo Igniters, medical applications etc.

PZT-4 is used for high power applications where high electro-mechanical coupling co-efficient and low dielectric losses under high driving field and a high coercive field are essential. This accepts more AC driving field without deposing and is ideally suited for high power electro-acoustic devices, ultrasonic cleaners, high voltage generators, high power sonar, industrial Equipments etc.

PZT-8 is again used for; high power applications. It is an excellent choice when the highest electrical drive is required. Due to excellent dielectric stability and law mechanical loss at high drive condition it is used for ultrasonic welding, ultrasonic mixing/ dispersion, ultrasonic surgery and some chemistry etc.

PZT-5J is used for low power applications where high permittivity and high piezo electric voltage constant required. This material is used in fuses, hydrophones and other applications that require a combination of high energy and high voltage output.

PZT 5H is again used for low power applications where extremely high permittivity, coupling co-efficient and piezoelectric charge coefficient required. It is an excellent material for field sensors, Level sensors, Actuator & Accelorometers, Buzzers ultrasonic NDT applications and material imaging applications.

Material Characteristics

A.

PHYSICAL PROPERTIES*

SYMBOL

PZT-5A

PZT-4

PZT-8

PZT-5H

PZT-5J

1.

Density gm/cc

δ

7.6

7.5

7.6

7.4

7.5

2.

Curie Temperature

Tc.

320 C

300 C

300 C

210 C

225 C

3.

Mech. Q

Qm

85

400

1000

70

70

B.

DIELECTRIC PROPERTIES

1.

Dielectric Constant at 1 KHz

K3t

1600

1250

1000

3250

2600

2.

Dissipation factor at 1 KHz

tanδ

0.02

0.005

0.004

0.02

0.02

3.

Resistivity

Ω-cm

10-12

B.

ELECTRO-MECHANICAL DATA

1.

Coupling co-efficient

KP

0.55

0.52

0.51

0.56

0.62

K31

0.31

0.28

0.30

0.34

0.37

K33

0.68

0.65

0.60

0.68

0.72

2.

Piezoelectric Charge constant (C/NX10-12)

D33

3.50

2.40

225

580

480

3.

Piezoelectric Voltage constant (10-3 volts-meter/ Newton)

g33

25

22

25.4

20

20

D.

FREQUENCY CONSTANTS

1.

Radial Mode (Hz-meter)

NP

2000

2200

2340

2000

-

2.

Thickness Mode (Hz-meter)

N3T

1800

1900

2070

1950

1980

* These typical values are provided for design information only.

Standard tolerances are ±20% of these values measured after 24 hours of Polarization at 25°C.

Piezoelectric Elements

Circular Discs of different diameters to a maximum of 100 cm and thickness upto 15 mm can be supplied.